Well damn. I don't own any of their mags, and I have what I consider a sufficient number of AR mags. I'll have to see what else they make.
They make pulls for magazines, which is their original product. Replaces the floorplate of metal AR mags to get a better grip on the mag when the mag is tucked deep into a pouch.
They also make:
AR and AK magazines. No pistol mags that I know of.
Stocks, handguards, sights, pistol grips for ARs.
Stocks, handguards for Remington 870s.
Probably some other stuff, too.